Grinding-wheel for granite.



P. DUNN.

GRINDING WHEEL FOR GRANITE.

APPLICATION FILED MAY 27, 1913.

Patented Sept. 2, 1913.

WITNESSES G Mwtug ATTORNEYS PATRICK DUNN, OF NEW YORK, N. Y.

GRINDING-WHEEL FOR GRANITE.

Specification of Letters Patent.

iatcntcd Sept. 75. 3913.

Application filed May 27, 1913. Serial No. 770,141.

To (11/ ii /mm. it may concern Be it known that I, Plvrnion DUNN, a citizen of the United States, and a resident of the city of New York, Long Island City, borough of Queens, in the county of Queens and State of New York, have invented a new and Improved Grinding-\Vheel :t'or Granite, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: to pro ride for feeding the chilled steel shot to the block wheel while the same is rotated; to accomplish the above purpose without scattering the shot or cutting material; to provide means for preventingthe scattering of the grinding material, and the consequent. loss of time; and to provide means for securing the iron to a wheel, so that the same does not become loosened.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views, and in which Figure 1 is a 1 )erspective view of a wheel constructed and arranged in accordance with the present invention; Fig. 2 is a vertical section taken on the line 2-2 in Fig. 3; Fig. 3 is a vertical section taken on the line 3-3 in Fig. 2; and Fig. 4 is a bottom plan view of the wheel.

As shown in the accompanying drawings, the tool consists primarily of a wheel 9. The wheel 9 is provided with a central hopper formed by upstanding flanges 10 flared upwardly and outwardly, as best seen in Figs. 1 and 3 of the drawings. The wheel 9 is also perforated to receive the threaded shanks 11 of anchor bolts 12. The anchor bolts 12 are tapered and square in cross sec tion, as seen in Figs. 3 and t of the drawings, to fit corresponding recesses provided in the block 13.

The block 13 is preferably constructed from soft steel, and is formed as a solid structure, having an average thickness of approximately four inches. The block is circular in shape, conforming accurately to the dimensions of the wheel 9, and is provided with a series of radially-disposed grooves 1 1. The grooves 14 are triangular in cross section, the pitch of the angle being set back, or, in other words, the opposite sides of the grooves are both inclined backward from the rotary-path direction in which the block 1 is normally moved. The grcovcs l-l, as sccn in Fig. -loi the drawings. are freely opened to a central space '15. The space 15 is termed by the inclined walls of the block 13, which walls are inclined oppositely to the inner walls of the tlange 10. The walls oi. the llange l0 and ot' the block 13 form a pocket or hopper for receiving and tor holding loosclythc abrasivematerial with which the wheel is provided. The wheel 5) and block 13 are rotated in service, being connected lor this purpose with a power source by a transmission shaft, the connection being formed by vertical brackets l8, l8. Said shatt is perforated to re ceive and pass thercthrough a bolt; 20. The connection "Formed by means of the bolt 20 is what may he termed a temporary connection, it being designed that when the iron is not employed, it may be disconnected from the transmission shaft. F or this purpose, the end of the bolt 20 is provided with an elongated slot. through which may be driven the wedge pin 21.

The head 17 is integrally connected with a cross bar 22, this being ellected by the intermediate pedestal 23. At each end of the cross bar 22, a squared portion 24- is produced for seating between a square recess having parallel :laces formed in the two sections of the flange .10, shown best in Fig. .l. of the drawings.

To hold the cross bar 22 in position, there are provided bolts 25, with nuts 26 and an anchor head 27. The heads 27 are seated in reamed, ends of perforations formed in the wheel 9, while the bolts extend upward, to be threaded through perforations provided therefor in the cross bar 22.

H will be noted that the upper edge of the cross bar 29 is tapered, to present a shedding upper surface to guide the steel shot generally used in this trade tor cutting the stone, into the open space 15, the overhung walls whcreol then serve to prevent the throwing ot the shot out of said recess. It will also be observed that the upper edge of the bar 22 is below the edge of the [hinge 10. This construction, using the head 17 and the pedestal 29 centrally located and united to the bar 22, provides a clear space between said head and flange '10, wherein may be poured the shot; during the rotation of the wheel S) and block 1?). The pouring ot' the shot, when using such a construction, is not accompanied by the usual seattering thereof. lhe saving effected by the use of a wheel where the shot may be poured into the center thereof, to be distributed therefrom by the radially-disposed grooves, must be obvious. The centrifugal action of the wheel tends to throw the shot outward to the perimeter of the block'13. This tendency insures a constant charge for the grooves 14. The grooves 16 being closed at the upper ends, the shot is prevented thereby from flying beyond the wheel, to be scattered or lost thereby, or, if unnoticed, to remain upon the stone, mar-ring the surface thereof, and thereby requiring an err tra amount of finishing by the carborundum and bufling wheels which follow the operation performed by the ironing wheel herein described.

If desired, any form of cap or hood may be used in conjunction with the wheel 9, which, riding or resting yieldingly upon the stone outside the periphery of the block 13, prevent the escape of any particles of the shot thrown or scattered by the block 13.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A wheel as characterized, comprising an open-centered ring grinding block, said block being provided with a series of radially-disposed grooves, said grooves being closed at the outer end and open at the inner end; a Wheel having an upstanding flange surrounding the open center of said ring block to form a hopper to receive grinding particles; a coupling head having upstanding brackets spaced apart to receive a rotary shaft for revolving said Wheel; and a cross bar rigidly connected with and extended between the lower edges of said flange, said bar being operatively connected with said head by a relatively small and centrallydisposed pedestal, said head overhanging said pedestal to form a cap therefor and to form in conjunction with said flange an annular free opening for said hopper.

2. A wheel as characterized, comprising an open-centered ring grinding block; a wheel for supporting same; means for rigidly fastening said wheel and said block; a centrally-disposed upwardly-extending hopper mounted on said wheel; a bar eX- tending across said hopper, said bar being maintained at a level below the upper edge of said hopper; and a coupling head rigidly connected with said bar by means of a relatively small, centrally-disposed pedestal, said head being extended beyond the side of said pedestal to form a hood-like overhang for said hopper.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PATRICK DUNN.

Witnesses:

E. F. MURDooK, PHILIP D. RoLLHAUs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G, V 

